Summer Nights from Grease is featured in Yes/No, the tenth episode of Season Three. It is sung by Mercedes and Sam with some of the New Directions having lines in the song. Finn, Kurt, Puck, Rachel, Rory, Santana, Sugar, and Tina provided back-up.

This song opens the episode. The girls of New Directions and the boys of New Directions ask Mercedes and Sam to talk about each other. Mercedes and Sam feel pressured so they begin to sing this song after the short scene, to tell the story of their summer fling, which the song is about.